One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6,10,12,9,14,8,13)(7,11,17,18,15,19,16,20)(21,22)(23,29)(24,27)(25,28)(26,32)(30,34)(31,36)(33,35)(1,2,4,3)(5,7)(6,11)(8,16)(9,15)(10,17)(12,18)(13,20)(14,19)(21,23,30,31,24,32,25,33)(22,26,34,35,27,29,28,36)(6,12)(8,10)(11,18)(13,14)(16,17)(19,20)(23,31)(25,30)(26,35)(28,34)(29,36)(32,33) involution — undirected(1,3,4,2)(7,15)(11,19)(16,17)(18,20)(22,27)(26,29)(28,34)(35,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.